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简便计算要学会观察算式，找到数与数之间的关系用对简便方法
小升初简便计算
小学简便计算7/13
App01:54
App01:44
App01:16
App01:51
App03:06
App01:54
App01:32
App02:01
App03:02
App01:26
App02:24
App01:18
App01:54打开App观看
小升初简便计算
App01:54App01:44App01:16App01:51App03:06App01:54App01:32App02:01App03:02App01:26App02:24App01:18App01:54
